kfifo: add explicit error checking in all the examples
Provide a check in all the kfifo examples to validate the correct
execution of each testcase.
Signed-off-by: Andrea Righi <arighi@develer.com>
Acked-by: Stefani Seibold <stefani@seibold.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/samples/kfifo/inttype-example.c b/samples/kfifo/inttype-example.c
index d6c5b7d..71b2aab 100644
--- a/samples/kfifo/inttype-example.c
+++ b/samples/kfifo/inttype-example.c
@@ -44,10 +44,17 @@
static DEFINE_KFIFO(test, int, FIFO_SIZE);
#endif
+static const int expected_result[FIFO_SIZE] = {
+ 3, 4, 5, 6, 7, 8, 9, 0,
+ 1, 20, 21, 22, 23, 24, 25, 26,
+ 27, 28, 29, 30, 31, 32, 33, 34,
+ 35, 36, 37, 38, 39, 40, 41, 42,
+};
+
static int __init testfunc(void)
{
int buf[6];
- int i;
+ int i, j;
unsigned int ret;
printk(KERN_INFO "int fifo test start\n");
@@ -66,8 +73,13 @@
ret = kfifo_in(&test, buf, ret);
printk(KERN_INFO "ret: %d\n", ret);
- for (i = 20; i != 30; i++)
- kfifo_put(&test, &i);
+ /* skip first element of the fifo */
+ printk(KERN_INFO "skip 1st element\n");
+ kfifo_skip(&test);
+
+ /* put values into the fifo until is full */
+ for (i = 20; kfifo_put(&test, &i); i++)
+ ;
printk(KERN_INFO "queue len: %u\n", kfifo_len(&test));
@@ -75,10 +87,20 @@
if (kfifo_peek(&test, &i))
printk(KERN_INFO "%d\n", i);
- /* print out all values in the fifo */
- while (kfifo_get(&test, &i))
- printk("%d ", i);
- printk("\n");
+ /* check the correctness of all values in the fifo */
+ j = 0;
+ while (kfifo_get(&test, &i)) {
+ printk(KERN_INFO "item = %d\n", i);
+ if (i != expected_result[j++]) {
+ printk(KERN_WARNING "value mismatch: test failed\n");
+ return -EIO;
+ }
+ }
+ if (j != ARRAY_SIZE(expected_result)) {
+ printk(KERN_WARNING "size mismatch: test failed\n");
+ return -EIO;
+ }
+ printk(KERN_INFO "test passed\n");
return 0;
}
@@ -132,7 +154,12 @@
return ret;
}
#endif
- testfunc();
+ if (testfunc() < 0) {
+#ifdef DYNAMIC
+ kfifo_free(&test);
+#endif
+ return -EIO;
+ }
if (proc_create(PROC_FIFO, 0, NULL, &fifo_fops) == NULL) {
#ifdef DYNAMIC
